It looks like this might be an avionics 1553 processor or
interface/controller for unibus PDP/VAX. ( from the STC 1553
transcievers ) It looks too complex to be only a 1553 serial
bus interface, but with the 2901 bit slice and 2910 microsequencer,
it might be a complete CPU to do development on a unibus host.
MIL-STD -1553 is a bidirectional, 1 Mbit serial, TDM, manchester II biphase
encoded,
dual-redundant avionics bus that runs on stub terminated twisted shielded
pair media.
(hence the BNCs). It supports 31 TDM "terminals" in a 20 bit paritied
words (3sync+16data+P).
Messages contain at least one command word and max 32 16 bit data words, on
5 bit
addresses/subadresses.
MIL-STD-1773 defines the newer optical cabling fiber based bus. 1553 was
typically used in military and fighter aircraft for interconnecting INS/GPS,
fly by wire,
engine management, and even flight controls. The standard dual redundant
paths improve
reliability - thus cuts down on airplane crashes somewhat ;)
The DC/DC might be for generating an isolated or odd supply for the STC
transceivers, even though they are generally transformer coupled and
resistor terminated
in the wiring hardness.
Some google links show that the navy used an IMUTS Unibus based system to
test
carrier aircraft IMU/INS :
http://www.globalsecurity.org/military/library/policy/navy/ntsp/imuts-a.htm
An online resume indicated development of a VMS driver for a VAX based 1553.
see
http://www.testsystems.com/pdf/overview.pdf
http://www.ampol-tech.com/what1553.htm
regards
Heinz
> I got this Q/UniBus board set:
> http://www.unixag-kl.fh-kl.de/~jkunz/qbus_1.jpg (105 kB)
> http://www.unixag-kl.fh-kl.de/~jkunz/qbus_2.jpg (128 kB)
> The first is the top card (towards CPU). I think it is QBus, as I got it
> together with some other QBus / MicroVAX stuff.
Received on Fri Nov 29 2002 - 16:46:01 GMT
